A recent survey of one COVID-19 survivor group on Facebook revealed that 27 percent of the over 1,500 members were experiencing hair loss as an ongoing issue. Experts believe these are cases of telogen effluvium, a condition in which body change or extreme shock causes hair to fall out. It can be triggered by multiple causes, including surgery, major physical trauma, physiological stress, illness, extreme weight loss, and some medications, but does not typically last longer than six months, according to an article from Harvard Medical School.